[bd520203] | 1 | /* |
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| 2 | * /dev/ptyXX (A first version for pseudo-terminals) |
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| 3 | * |
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| 4 | * Author: Fernando RUIZ CASAS (fernando.ruiz@ctv.es) |
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| 5 | * May 2001 |
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| 6 | * |
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| 7 | * This program is distributed in the hope that it will be useful, |
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| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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| 10 | * |
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| 11 | * $Id$ |
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| 12 | */ |
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[c8f05db] | 13 | |
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| 14 | #ifdef HAVE_CONFIG_H |
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| 15 | #include "config.h" |
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| 16 | #endif |
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| 17 | |
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[bd520203] | 18 | /*-----------------------------------------*/ |
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| 19 | #include <termios.h> |
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| 20 | #include <rtems.h> |
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| 21 | #include <rtems/libio.h> |
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| 22 | #include <rtems/pty.h> |
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[e3eab02] | 23 | #include <rtems/bspIo.h> |
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[bd520203] | 24 | /*-----------------------------------------*/ |
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| 25 | #include <stdio.h> |
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| 26 | #include <stdlib.h> |
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| 27 | #include <string.h> |
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| 28 | #include <unistd.h> |
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| 29 | /*-----------------------------------------*/ |
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| 30 | #define IAC_ESC 255 |
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| 31 | #define IAC_DONT 254 |
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| 32 | #define IAC_DO 253 |
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| 33 | #define IAC_WONT 252 |
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| 34 | #define IAC_WILL 251 |
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| 35 | #define IAC_SB 250 |
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| 36 | #define IAC_GA 249 |
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| 37 | #define IAC_EL 248 |
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| 38 | #define IAC_EC 247 |
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| 39 | #define IAC_AYT 246 |
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| 40 | #define IAC_AO 245 |
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| 41 | #define IAC_IP 244 |
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| 42 | #define IAC_BRK 243 |
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| 43 | #define IAC_DMARK 242 |
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| 44 | #define IAC_NOP 241 |
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| 45 | #define IAC_SE 240 |
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| 46 | #define IAC_EOR 239 |
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| 47 | |
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[d3d2afdf] | 48 | typedef struct { |
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[bd520203] | 49 | char *devname; |
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| 50 | struct rtems_termios_tty *ttyp; |
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| 51 | tcflag_t c_cflag; |
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| 52 | int opened; |
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| 53 | int socket; |
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| 54 | |
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| 55 | int last_cr; |
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| 56 | int iac_mode; |
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[d3d2afdf] | 57 | } pty_t; |
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[bd520203] | 58 | |
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| 59 | |
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| 60 | int ptys_initted=FALSE; |
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[d3d2afdf] | 61 | pty_t *ptys; |
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| 62 | int rtems_telnetd_maximum_ptys; |
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[bd520203] | 63 | |
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| 64 | /* This procedure returns the devname for a pty slot free. |
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| 65 | * If not slot availiable (field socket>=0) |
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| 66 | * then the socket argument is closed |
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| 67 | */ |
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| 68 | |
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| 69 | char * get_pty(int socket) { |
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| 70 | int ndx; |
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| 71 | if (!ptys_initted) return NULL; |
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[d3d2afdf] | 72 | for (ndx=0;ndx<rtems_telnetd_maximum_ptys;ndx++) { |
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[bd520203] | 73 | if (ptys[ndx].socket<0) { |
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| 74 | ptys[ndx].socket=socket; |
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| 75 | return ptys[ndx].devname; |
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| 76 | }; |
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| 77 | }; |
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| 78 | close(socket); |
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| 79 | return NULL; |
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| 80 | } |
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| 81 | |
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| 82 | |
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| 83 | /*-----------------------------------------------------------*/ |
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| 84 | /* |
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| 85 | * The NVT terminal is negociated in PollRead and PollWrite |
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| 86 | * with every BYTE sendded or received. |
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| 87 | * A litle status machine in the pty_read_byte(int minor) |
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| 88 | * |
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| 89 | */ |
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| 90 | const char IAC_AYT_RSP[]="\r\nAYT? Yes, RTEMS-SHELL is here\r\n"; |
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| 91 | const char IAC_BRK_RSP[]="<*Break*>"; |
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| 92 | const char IAC_IP_RSP []="<*Interrupt*>"; |
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| 93 | |
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| 94 | |
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| 95 | static |
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| 96 | int send_iac(int minor,unsigned char mode,unsigned char option) { |
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| 97 | unsigned char buf[3]; |
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| 98 | buf[0]=IAC_ESC; |
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| 99 | buf[1]=mode; |
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| 100 | buf[2]=option; |
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| 101 | return write(ptys[minor].socket,buf,sizeof(buf)); |
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| 102 | } |
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| 103 | |
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| 104 | int read_pty(int minor) { /* Characters writed in the client side*/ |
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| 105 | unsigned char value; |
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| 106 | int count; |
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| 107 | int result; |
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| 108 | count=read(ptys[minor].socket,&value,sizeof(value)); |
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| 109 | if (count<1) { |
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| 110 | fclose(stdin); |
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| 111 | fclose(stdout); |
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| 112 | fclose(stderr); |
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| 113 | /* If you don't read from the socket the system ends the task */ |
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| 114 | rtems_task_delete(RTEMS_SELF); |
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| 115 | }; |
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| 116 | switch(ptys[minor].iac_mode) { |
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| 117 | case IAC_ESC: |
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| 118 | ptys[minor].iac_mode=0; |
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| 119 | switch(value) { |
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| 120 | case IAC_ESC : |
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| 121 | return IAC_ESC; |
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| 122 | case IAC_DONT: |
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| 123 | case IAC_DO : |
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| 124 | case IAC_WONT: |
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| 125 | case IAC_WILL: |
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| 126 | ptys[minor].iac_mode=value; |
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| 127 | return -1; |
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| 128 | case IAC_SB : |
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| 129 | return -100; |
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| 130 | case IAC_GA : |
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| 131 | return -1; |
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| 132 | case IAC_EL : |
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| 133 | return 0x03; /* Ctrl-C*/ |
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| 134 | case IAC_EC : |
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| 135 | return '\b'; |
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| 136 | case IAC_AYT : |
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| 137 | write(ptys[minor].socket,IAC_AYT_RSP,strlen(IAC_AYT_RSP)); |
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| 138 | return -1; |
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| 139 | case IAC_AO : |
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| 140 | return -1; |
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| 141 | case IAC_IP : |
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| 142 | write(ptys[minor].socket,IAC_IP_RSP,strlen(IAC_IP_RSP)); |
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| 143 | return -1; |
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| 144 | case IAC_BRK : |
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| 145 | write(ptys[minor].socket,IAC_BRK_RSP,strlen(IAC_BRK_RSP)); |
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| 146 | return -1; |
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| 147 | case IAC_DMARK: |
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| 148 | return -2; |
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| 149 | case IAC_NOP : |
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| 150 | return -1; |
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| 151 | case IAC_SE : |
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| 152 | return -101; |
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| 153 | case IAC_EOR : |
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| 154 | return -102; |
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| 155 | default : |
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| 156 | return -1; |
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| 157 | }; |
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| 158 | break; |
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| 159 | case IAC_WILL: |
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| 160 | ptys[minor].iac_mode=0; |
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| 161 | if (value==34){send_iac(minor,IAC_DONT, 34); /*LINEMODE*/ |
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| 162 | send_iac(minor,IAC_DO , 1);} else /*ECHO */ |
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| 163 | {send_iac(minor,IAC_DONT,value);}; |
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| 164 | return -1; |
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| 165 | case IAC_DONT: |
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| 166 | ptys[minor].iac_mode=0; |
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| 167 | return -1; |
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| 168 | case IAC_DO : |
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| 169 | ptys[minor].iac_mode=0; |
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| 170 | if (value==3) {send_iac(minor,IAC_WILL, 3);} else /* GO AHEAD*/ |
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| 171 | if (value==1) { } else /* ECHO */ |
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| 172 | {send_iac(minor,IAC_WONT,value);}; |
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| 173 | return -1; |
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| 174 | case IAC_WONT: |
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| 175 | ptys[minor].iac_mode=0; |
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| 176 | if (value==1) {send_iac(minor,IAC_WILL, 1);} else /* ECHO */ |
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| 177 | {send_iac(minor,IAC_WONT,value);}; |
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| 178 | return -1; |
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| 179 | default: |
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| 180 | ptys[minor].iac_mode=0; |
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| 181 | if (value==IAC_ESC) { |
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| 182 | ptys[minor].iac_mode=value; |
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| 183 | return -1; |
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| 184 | } else { |
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| 185 | result=value; |
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| 186 | if ((value=='\n') && (ptys[minor].last_cr)) result=-1; |
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| 187 | ptys[minor].last_cr=(value=='\r'); |
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| 188 | return result; |
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| 189 | }; |
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| 190 | }; |
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| 191 | |
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| 192 | } |
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| 193 | |
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| 194 | /*-----------------------------------------------------------*/ |
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| 195 | static int ptySetAttributes(int minor,const struct termios *t); |
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| 196 | static int ptyPollInitialize(int major,int minor,void * arg) ; |
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| 197 | static int ptyShutdown(int major,int minor,void * arg) ; |
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| 198 | static int ptyPollWrite(int minor, const char * buf,int len) ; |
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| 199 | static int ptyPollRead(int minor) ; |
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| 200 | const rtems_termios_callbacks * pty_get_termios_handlers(int polled) ; |
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| 201 | /*-----------------------------------------------------------*/ |
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| 202 | /* Set the 'Hardware' */ |
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| 203 | /*-----------------------------------------------------------*/ |
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| 204 | static int |
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| 205 | ptySetAttributes(int minor,const struct termios *t) { |
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[d3d2afdf] | 206 | if (minor<rtems_telnetd_maximum_ptys) { |
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[bd520203] | 207 | ptys[minor].c_cflag=t->c_cflag; |
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| 208 | } else { |
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| 209 | return -1; |
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| 210 | }; |
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| 211 | return 0; |
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| 212 | } |
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| 213 | /*-----------------------------------------------------------*/ |
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| 214 | static int |
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| 215 | ptyPollInitialize(int major,int minor,void * arg) { |
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| 216 | rtems_libio_open_close_args_t * args = arg; |
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| 217 | struct termios t; |
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[d3d2afdf] | 218 | if (minor<rtems_telnetd_maximum_ptys) { |
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[bd520203] | 219 | if (ptys[minor].socket<0) return -1; |
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| 220 | ptys[minor].opened=TRUE; |
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| 221 | ptys[minor].ttyp=args->iop->data1; |
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| 222 | t.c_cflag=B9600|CS8;/* termios default */ |
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| 223 | return ptySetAttributes(minor,&t); |
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| 224 | } else { |
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| 225 | return -1; |
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| 226 | }; |
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| 227 | } |
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| 228 | /*-----------------------------------------------------------*/ |
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| 229 | static int |
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| 230 | ptyShutdown(int major,int minor,void * arg) { |
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[d3d2afdf] | 231 | if (minor<rtems_telnetd_maximum_ptys) { |
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[bd520203] | 232 | ptys[minor].opened=FALSE; |
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| 233 | if (ptys[minor].socket>=0) close(ptys[minor].socket); |
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| 234 | ptys[minor].socket=-1; |
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| 235 | chown(ptys[minor].devname,2,0); |
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| 236 | } else { |
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| 237 | return -1; |
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| 238 | }; |
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| 239 | return 0; |
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| 240 | } |
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| 241 | /*-----------------------------------------------------------*/ |
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| 242 | /* Write Characters into pty device */ |
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| 243 | /*-----------------------------------------------------------*/ |
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| 244 | static int |
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| 245 | ptyPollWrite(int minor, const char * buf,int len) { |
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| 246 | int count; |
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[d3d2afdf] | 247 | if (minor<rtems_telnetd_maximum_ptys) { |
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[bd520203] | 248 | if (ptys[minor].socket<0) return -1; |
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| 249 | count=write(ptys[minor].socket,buf,len); |
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| 250 | } else { |
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| 251 | count=-1; |
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| 252 | }; |
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| 253 | return count; |
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| 254 | } |
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| 255 | /*-----------------------------------------------------------*/ |
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| 256 | static int |
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| 257 | ptyPollRead(int minor) { |
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| 258 | int result; |
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[d3d2afdf] | 259 | if (minor<rtems_telnetd_maximum_ptys) { |
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[bd520203] | 260 | if (ptys[minor].socket<0) return -1; |
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| 261 | result=read_pty(minor); |
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| 262 | return result; |
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| 263 | }; |
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| 264 | return -1; |
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| 265 | } |
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| 266 | /*-----------------------------------------------------------*/ |
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| 267 | static const rtems_termios_callbacks pty_poll_callbacks = { |
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| 268 | ptyPollInitialize, /* FirstOpen*/ |
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| 269 | ptyShutdown, /* LastClose*/ |
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| 270 | ptyPollRead, /* PollRead */ |
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| 271 | ptyPollWrite, /* Write */ |
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| 272 | ptySetAttributes, /* setAttributes */ |
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| 273 | NULL, /* stopRemoteTX */ |
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| 274 | NULL, /* StartRemoteTX */ |
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| 275 | 0 /* outputUsesInterrupts */ |
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| 276 | }; |
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| 277 | /*-----------------------------------------------------------*/ |
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| 278 | const rtems_termios_callbacks * pty_get_termios_handlers(int polled) { |
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| 279 | return &pty_poll_callbacks; |
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| 280 | } |
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| 281 | /*-----------------------------------------------------------*/ |
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| 282 | void init_ptys(void) { |
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| 283 | int ndx; |
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[d3d2afdf] | 284 | ptys = malloc( sizeof(pty_t) * rtems_telnetd_maximum_ptys ); |
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| 285 | for (ndx=0;ndx<rtems_telnetd_maximum_ptys;ndx++) { |
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[bd520203] | 286 | ptys[ndx].devname=malloc(strlen("/dev/ptyXX")+1); |
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| 287 | sprintf(ptys[ndx].devname,"/dev/pty%X",ndx); |
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| 288 | ptys[ndx].ttyp=NULL; |
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| 289 | ptys[ndx].c_cflag=CS8|B9600; |
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| 290 | ptys[ndx].socket=-1; |
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| 291 | ptys[ndx].opened=FALSE; |
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| 292 | |
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| 293 | }; |
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| 294 | ptys_initted=TRUE; |
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| 295 | } |
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| 296 | |
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| 297 | |
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| 298 | /*-----------------------------------------------------------*/ |
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| 299 | /* pty_initialize |
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| 300 | * |
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| 301 | * This routine initializes the pty IO driver. |
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| 302 | * |
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| 303 | * Input parameters: NONE |
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| 304 | * |
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| 305 | * Output parameters: NONE |
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| 306 | * |
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| 307 | * Return values: |
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| 308 | */ |
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| 309 | /*-----------------------------------------------------------*/ |
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| 310 | rtems_device_driver pty_initialize( |
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| 311 | rtems_device_major_number major, |
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| 312 | rtems_device_minor_number minor, |
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| 313 | void *arg |
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| 314 | ) |
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| 315 | { |
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| 316 | int ndx; |
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[d3d2afdf] | 317 | rtems_status_code status; |
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[bd520203] | 318 | |
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| 319 | /* |
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| 320 | * Set up ptys |
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| 321 | */ |
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| 322 | |
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| 323 | init_ptys(); |
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| 324 | |
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| 325 | /* |
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| 326 | * Register the devices |
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| 327 | */ |
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[d3d2afdf] | 328 | for (ndx=0;ndx<rtems_telnetd_maximum_ptys;ndx++) { |
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[bd520203] | 329 | status = rtems_io_register_name(ptys[ndx].devname, major, ndx); |
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| 330 | if (status != RTEMS_SUCCESSFUL) |
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| 331 | rtems_fatal_error_occurred(status); |
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| 332 | chmod(ptys[ndx].devname,0660); |
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| 333 | chown(ptys[ndx].devname,2,0); /* tty,root*/ |
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| 334 | }; |
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[d3d2afdf] | 335 | printk("Device: /dev/pty%X../dev/pty%X (%d)pseudo-terminals registered.\n", |
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| 336 | 0,rtems_telnetd_maximum_ptys-1,rtems_telnetd_maximum_ptys); |
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[bd520203] | 337 | |
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| 338 | return RTEMS_SUCCESSFUL; |
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| 339 | } |
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| 340 | |
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| 341 | |
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| 342 | /* |
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| 343 | * Open entry point |
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| 344 | */ |
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| 345 | |
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| 346 | rtems_device_driver pty_open( |
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| 347 | rtems_device_major_number major, |
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| 348 | rtems_device_minor_number minor, |
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| 349 | void * arg |
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| 350 | ) |
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| 351 | { |
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| 352 | rtems_status_code sc ; |
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| 353 | sc = rtems_termios_open(major,minor,arg,pty_get_termios_handlers(FALSE)); |
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| 354 | return sc; |
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| 355 | } |
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| 356 | |
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| 357 | /* |
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| 358 | * Close entry point |
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| 359 | */ |
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| 360 | |
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| 361 | rtems_device_driver pty_close( |
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| 362 | rtems_device_major_number major, |
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| 363 | rtems_device_minor_number minor, |
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| 364 | void * arg |
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| 365 | ) |
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| 366 | { |
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| 367 | return rtems_termios_close(arg); |
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| 368 | } |
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| 369 | |
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| 370 | /* |
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| 371 | * read bytes from the pty |
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| 372 | */ |
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| 373 | |
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| 374 | rtems_device_driver pty_read( |
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| 375 | rtems_device_major_number major, |
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| 376 | rtems_device_minor_number minor, |
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| 377 | void * arg |
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| 378 | ) |
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| 379 | { |
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| 380 | return rtems_termios_read(arg); |
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| 381 | } |
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| 382 | |
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| 383 | /* |
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| 384 | * write bytes to the pty |
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| 385 | */ |
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| 386 | |
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| 387 | rtems_device_driver pty_write( |
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| 388 | rtems_device_major_number major, |
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| 389 | rtems_device_minor_number minor, |
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| 390 | void * arg |
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| 391 | ) |
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| 392 | { |
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| 393 | return rtems_termios_write(arg); |
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| 394 | } |
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| 395 | |
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| 396 | /* |
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| 397 | * IO Control entry point |
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| 398 | */ |
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| 399 | |
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| 400 | rtems_device_driver pty_control( |
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| 401 | rtems_device_major_number major, |
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| 402 | rtems_device_minor_number minor, |
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| 403 | void * arg |
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| 404 | ) |
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| 405 | { |
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| 406 | return rtems_termios_ioctl(arg); |
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| 407 | } |
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